Re: [PATCH-for-9.1] hw/i386: Add a config to only build the microvm machine

[Michael Tokarev]

26.03.2024 16:14, Philippe Mathieu-Daudé wrote:
> Add a config file to build a binary only containing the
> microvm machine, inspired by a discussion on the list:
> 604bf457-23a7-4d06-b59f-a7b46945c626@tls.msk.ru/">https://lore.kernel.org/qemu-devel/604bf457-23a7-4d06-b59f-a7b46945c626@tls.msk.ru/
>
> As suggested in commit d1d5e9eefd ("configure: allow the
> selection of alternate config in the build"), it can be
> built using:
>
>    $ ../configure --without-default-features \
>                   --target-list=x86_64-softmmu \
>                   --with-devices-x86_64=microvm
>
> Inspired-by: Michael Tokarev <mjt@tls.msk.ru>
> Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
> ---
>   configs/devices/x86_64-softmmu/microvm.mak | 20 ++++++++++++++++++++
>   1 file changed, 20 insertions(+)
>   create mode 100644 configs/devices/x86_64-softmmu/microvm.mak

This is not enough.  This step is good already, but it lacks default machine
type selection.  In debian we carry a tiny patch to make microvm the default
machine type or else it crashes at startup not finding "pc" machine or one
of its required devices.

/mjt

> diff --git a/configs/devices/x86_64-softmmu/microvm.mak 
> b/configs/devices/x86_64-softmmu/microvm.mak
> new file mode 100644
> index 0000000000..fe48b5b4a7
> --- /dev/null
> +++ b/configs/devices/x86_64-softmmu/microvm.mak
> @@ -0,0 +1,20 @@
> +# SPDX-FileCopyrightText: 2024 Linaro Ltd.
> +#
> +# Config that only supports the 64-bit microvm machine.
> +# This avoids bringing in any of numerous legacy features from
> +# the legacy machines or the 32bit platform.
> +#
> +
> +CONFIG_MICROVM=y
> +CONFIG_PCI_DEVICES=n
> +CONFIG_SMBIOS=y
> +CONFIG_SMBIOS_LEGACY=n
> +CONFIG_VIRTIO_BALLOON=y
> +CONFIG_VIRTIO_BLK=y
> +CONFIG_VIRTIO_CRYPTO=y
> +CONFIG_VIRTIO_GPU=y
> +CONFIG_VIRTIO_INPUT=y
> +CONFIG_VIRTIO_NET=y
> +CONFIG_VIRTIO_RNG=y
> +CONFIG_VIRTIO_SCSI=y
> +CONFIG_VIRTIO_SERIAL=y